package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
 * 用于公共字段自动填充的切面类
 * */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
     * 切入点
     * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /*
     * 前置通知
     * */
    @Before("autoFillPointCut()")
    //表示该方法为一个前置通知，在autoFillPointCut()前执行
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        //通过连接点对象获得方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得了操作类型insert / update

        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        //这里约定mapper层的第一个参数为实体
        Object object = args[0];

        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        if (operationType == OperationType.UPDATE) {
            Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(object,now);
            setUpdateUser.invoke(object,currentId);
        } else if (operationType==OperationType.INSERT){
            Method setCreateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setCreateTime.invoke(object,now);
            setCreateUser.invoke(object,currentId);
            setUpdateTime.invoke(object,now);
            setUpdateUser.invoke(object,currentId);
        }
    }
}
